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// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
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package org.apache.impala.util;

import org.apache.hadoop.hive.metastore.api.StorageDescriptor;
import org.apache.impala.thrift.TBucketInfo;
import org.apache.impala.thrift.TBucketType;

import com.google.common.base.Preconditions;

public class BucketUtils {

  /**
   * Parse to TBucketInfo from StorageDescriptor of the HMS table
   */
  public static TBucketInfo fromStorageDescriptor(StorageDescriptor sd) {
    Preconditions.checkNotNull(sd);
    if (sd.getBucketCols() == null || sd.getBucketCols().size() == 0
        || sd.getNumBuckets() == 0) {
      return new TBucketInfo(TBucketType.NONE, 0);
    }
    TBucketInfo bucketInfo = new TBucketInfo(TBucketType.HASH, sd.getNumBuckets());
    bucketInfo.setBucket_columns(sd.getBucketCols());
    return bucketInfo;
  }
}
